Pierce Butler, Loewers Gambrinus Brewery Company v…
“ The Senate amended by substituting 'depreciation' for 'exhaustion, wear and tear.' In conference, that word was taken out, and the provision was made to read as it now stands, 'a reasonable allowance for the exhaustion, wear and tear of property used in the trade or business, including a reasonable allowance for obsolescence.'None of the acts made any classification based on the causes from which obsolescence results. And, as the sole purpose is to arrive at the net income subject to taxation, it is clear that such a discrimination could not reasonably or justly be made. ”
